Catastophic computer crash and Photoshop Elements 18

After a recent computer crash, I have managed to retrieve almost everything but I am having trouble with Topaz Clarity, the compter will not allow me to transfer this to my Elements 18 any ideas please. I use Windows 10.

Legacy products can be found for download here, note it is either Clarity or Clarity in Studio:

I have been using Clarity for many years and it works well for me, I have managed to transfer it to Elements 18 once but cannot remember how I did this please help

If no one replies just raise a support request at the main website.